let context = wx.createCanvasContext('myCanvas',this); context.drawImage("data:image/jpeg;base64," + wx.arrayBufferToBase64(res.data), 0, 0, 150, 100); context.draw(true, function (rs){ wx.canvasToTempFilePath({ canvasId: 'myCanvas', success: function (res) { self.setData({ tempSavePath: res.tempFilePath }); } }) });

canvas画好base64图后保存到相册,在工具上是正常保存，到手机测试的时候保存出来是个白板